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You can say that but it doesn't make any sense to me. Wisdom and intelligence are also "associated with magical aptitude" and only one is "cosmically associated" with mental fortitude: wisdom. If a spell takes a 'toll on mind/spirit', I don't expect charisma to help with the saving throw.
It doesn't make sense to me that Clerics use Wisdom for spellcasting (they should use Charisma, since they're basically asking a god nicely to give them more power) and that Sorcerers use Charisma (they should use Wisdom, which represents their insight into their own magical abilities). And it doesn't make sense that Charisma is for Use Magic Device (that falls into the insight/instinct region).
Charisma for Resonance is equally nonsensical, but it's consistent with the past, and helps to balance out a stat that is otherwise mechanically weak for most classes.